Covering device for a liquid tank

Abstract

The invention relates to a covering device for liquid tanks, in particular swimming pools (1), comprising a buoyant covering element (2), the covering element (2) comprising a continuous covering layer (3) and a fluid chamber (4) connected to the covering layer (3), a pumping apparatus (5) being provided, which is designed to convey a liquid, in particular water, and / or a gas, in particular air, into the fluid chamber (4). The invention also relates to an assembly of a covering device according to the invention together with a liquid tank.

Description

[0001] The invention relates to a covering device for liquid containers having the features of the preamble of the independent patent claim.

[0002] Liquid containers, such as swimming pools, which have open surfaces are susceptible to contamination from the liquid they contain. Especially when placed outdoors, contamination from leaves, insects, and other unwanted objects can easily occur without a suitable cover.

[0003] In the case of swimming pools, which are often heated, the lack of a cover also leads to unwanted heat loss and thus increased heating costs, as well as increased evaporation of the pool water, necessitating regular refilling. Heat loss is particularly pronounced at low outdoor temperatures.

[0004] To avoid the aforementioned problems, cover devices for liquid containers, particularly for swimming pools, are known in the prior art. Such cover devices can be designed, for example, as rollable films, optionally with insulating air chambers, or as cover plates. Known systems are described in DE 24 06 441 A1, DE 27 13 793 A1, and DE 24 11 364 A1. Furthermore, FR 2 864 128 A1 describes a cover device that can be lowered to the bottom of a pool and raised again as needed.

[0005] However, such known cover devices have the problem that removing the cover before using the swimming pool often involves increased work.

[0006] Various devices are also known that allow covers to be raised or lowered automatically using complex mechanical mechanisms. However, such devices are often expensive to purchase and require intensive maintenance.

[0007] A common problem with the cover devices known in the prior art is that at temperatures below freezing, the evaporating water condenses and the cover freezes to the edge of the pool, making it impossible to lift the cover.

[0008] Furthermore, existing cover devices often require considerable effort to implement in existing pools. Conventional mechanical lifting devices cannot be used, especially with liner pools, because a permanent connection to the pool floor is not possible.

[0009] It is an object of the present invention to overcome these and other disadvantages of the covering devices known in the prior art and to provide an improved covering device.

[0010] The object of the invention is solved by the characterizing features of the independent patent claim.

[0011] A covering device according to the invention for liquid containers, in particular for swimming pools, comprises a buoyant covering element, wherein the covering element comprises a continuous covering layer and a fluid chamber connected to the covering layer.

[0012] The invention is characterized in that a pumping device is provided which is designed to convey a liquid, in particular water and / or a gas such as air, into the fluid chamber.

[0013] By pumping liquid and / or gas into the fluid chamber of the cover element, it is possible to change the average density of the cover element.

[0014] By increasing the average density above the density of the liquid contained in the container, the cover element sinks below the liquid level, making the liquid accessible from the outside. Lowering the cover element eliminates the need to manually remove it from the surface of the liquid.

[0015] In the context of the present invention, the term "average density" refers to the density of a mixture, composite, or assembly of several individual materials or elements. The average density is calculated based on the volume ratios of the individual materials or elements. For example, if 1 m3 of a porous insulation material with a density of approximately 0.5 g / cm3 is combined with 1 m3 of a concrete material with a density of approximately 2.3 g / cm3, the composite of insulation material and concrete material will have an average density of approximately 1.4 g / cm3. The combination of two or more materials or elements can be achieved by any method known to a person skilled in the art. It is not essential that the materials or elements be homogeneously mixed.For example, in the example mentioned above, two plates of the corresponding materials can be joined together, for example by bonding them together, to form a composite with the described average density.

[0016] Optionally, it can be provided that the cover layer is substantially planar and comprises a substantially planar insulation layer and a weighting layer arranged substantially plane-parallel to the insulation layer, wherein the cover layer preferably has an average density between 1.1 g / cm 3< and 3.0 g / cm 3< , preferably between 1.2 g / cm 3< and 2.0 g / cm 3< .

[0017] A flat cover layer is particularly preferred for covering the liquid container. On the one hand, the flat design allows for a space-saving construction, and on the other hand, it ensures a completely flat surface. This is particularly advantageous for preventing liquid condensation in cavities and the associated heat loss.

[0018] When the device is used as intended, the insulation layer is preferably arranged beneath the weighting layer. The weighting layer can optionally be formed by concrete slabs, stone slabs, or the like. Optionally, the weighting layer can be walkable.

[0019] If necessary, a reinforcement layer can be provided for stabilization. The reinforcement layer can be arranged, for example, between the weighting layer and the insulation layer. The reinforcement layer can also be arranged beneath the composite of the weighting layer and insulation layer. The reinforcement layer can be made of a mechanically reinforcing material, for example, wood, plastic, or metal.

[0020] If necessary, it can be provided that the insulation layer is arranged between the weighting layer and the fluid chamber.

[0021] Optionally, the fluid chamber may be designed as a hollow space, preferably as a substantially flat hollow space with a thickness of preferably 5 cm to 20 cm. The fluid chamber may be formed from a metallic material. Reinforcing elements may be provided inside the fluid chamber for reinforcement.

[0022] The hollow design allows the fluid chamber to be easily filled with liquid and / or gas.

[0023] If necessary, it can be provided that the fluid chamber comprises a plurality of individual chambers that are separate from one another and can be pressurized separately.

[0024] This makes it easy to adjust the average density of the cover element. For example, it can be empirically determined how many individual chambers need to be filled with liquid to cause the cover element to sink to a certain depth.

[0025] The use of individual chambers can also prevent the cover element from sinking in the event of a leak. To this end, the cover device can be designed in such a way that the cover element does not sink even if one, two, or more individual chambers are leaking.

[0026] Such individual chambers can optionally be arranged at a distance from one another. Individual chambers can be designed in the form of tubular bubbles and formed, for example, from a film material.

[0027] Optionally, it may be provided that the fluid chamber is formed from a flexible material such as a polyethylene film or the like or comprises such a material, so that its volume is variable under pressure.

[0028] This allows for a simple design of the fluid chamber. In this case, gas can be drawn out of the fluid chamber to reduce its volume, rather than filling it with liquid.

[0029] Optionally, it can be provided that the insulation layer has a thickness of preferably 5 cm to 20 cm and comprises polystyrene or consists of polystyrene.

[0030] A suitable thickness of the insulation layer ensures sufficient insulation. Furthermore, the low-density insulation layer serves to reduce the average density of the covering layer. Preferably, the weighting layer has a higher density than the insulation layer.

[0031] If necessary, the fluid chamber can be arranged essentially over the entire surface of the cover layer. This allows for a uniform raising and lowering of the cover layer. Alternatively, the fluid chamber or the individual chambers of the fluid chamber can also be distributed only partially and / or evenly over the cover layer.

[0032] Optionally, the fluid chamber can be connected to the pumping device via a flexible hose. The flexible hose can be designed to supply the fluid chamber with gas and / or liquid. The flexible nature of the hose is advantageous in allowing adaptation to different positioning of the cover element.

[0033] If necessary, the fluid chamber may be provided with a pressure relief valve for discharging water and / or air.

[0034] A pressure relief valve can be advantageous to prevent the fluid chamber from bursting due to excessive pressure. For example, the pressure relief valve can be designed to open at a pressure above 2 bar. The pressure relief valve can also be advantageously used to exchange liquid and gas in the fluid chamber. For example, with appropriate positioning of the pressure relief valve, liquid can be pumped into a gas-filled fluid chamber, whereupon the gas escapes via the pressure relief valve.

[0035] According to the invention, the pumping device comprises a water pump and an air pump, wherein a control device is provided for controlling the pumping device.

[0036] Alternatively, only one pump can be provided, which is designed to deliver gas and is designed to generate both an overpressure and a negative pressure. Filling the fluid chamber with liquid can then be achieved by generating a negative pressure and drawing in liquid via a valve.

[0037] The control device can be designed to control the pressure and / or the quantity of the supplied liquid or gas. Optionally, a pressure measuring device can be provided in the fluid chamber to measure the pressure in the fluid chamber. The pressure measuring device can be connected to the control device.

[0038] If necessary, it can be empirically determined how much fluid must be pumped into the fluid chamber to lower the cover element. Using these empirically determined values, the control device can regulate the supply of fluid and / or gas into the fluid chamber.

[0039] A depth measuring device can also be provided, which is designed to determine the depth at which the cover element is located at a specific time. The depth measuring device can, for example, comprise at least one light barrier. The light barrier can be arranged at least at a desired depth of the cover element. Alternatively, the depth measuring device can also comprise a distance meter. The depth measuring device can be connected to the control device in order to control the supply of gas and / or liquid into the fluid chamber in relation to the sinking depth of the cover element.

[0040] In the context of the present invention, the "sinking depth" can be defined as the normal distance between the liquid surface and the surface of the cover element.

[0041] Optionally, it may be provided that sliding rollers are provided on the outer edges of the cover element for sliding the cover element along the inner surface of the liquid container.

[0042] Optionally, projecting, preferably elastic, sealing elements can be provided on the outer edges of the cover element. The sealing elements can, for example, be formed by sealing lips that completely surround the outer periphery of the cover element. The sealing element(s) is designed such that, when the cover device is used as intended, it protrudes beyond the edge of the liquid container. This prevents heat from escaping or liquid from evaporating at the edge areas that may not be covered by the cover element.

[0043] The design with one or more sealing elements is particularly advantageous for swimming pools, as the aim is to prevent water surfaces from remaining unobstructed.

[0044] If necessary, the liquid container can be a liquid container with tapered wall elements. In this case, the sealing elements can serve to compensate for the gap between the wall of the liquid container and the cover element.

[0045] According to the invention, a filling medium is provided for filling the fluid chamber with liquid, which medium is guided in a closed filling medium circuit. If necessary, a compensation chamber can be provided to accommodate the filling medium.

[0046] If necessary, a flexible hose can be arranged on the pressure relief valve of the fluid chamber, which is designed to return the filling medium to the pumping device.

[0047] A separate circuit for the filling medium, whereby the filling medium does not come into contact with the liquid in the liquid container, prevents contamination of the liquid in the liquid container.

[0048] This is particularly advantageous for swimming pools, as undesirable bacterial growth can occur in the fluid contained in the fluid chamber. For hygiene reasons, the introduction of these bacteria into the pool water should be prevented.

[0049] Optionally, it can be provided that a compensation chamber is arranged on the outer edges of the cover element, preferably surrounding the cover element, which is designed to at least partially fill a gap between a wall of the liquid container and the cover element. Optionally, the compensation chamber can be connected to the pumping device. Optionally, the compensation chamber can be formed from a film material. Optionally, the compensation chamber can be formed from several separate sub-chambers.

[0050] If necessary, the cover element may be provided with continuous openings that allow fluid to pass through when the cover element is lowered. This improves the lowering properties.

[0051] The invention further relates to an arrangement of a covering device according to the invention with a liquid-filled container, in particular with a swimming pool. According to the invention, the covering element can be arranged or is arranged floating on the liquid surface in a first position, and that the covering element can be arranged or is arranged completely below the liquid surface in a second position.

[0052] In the second position, a liquid level is preferably provided above the cover element, allowing the intended use of the liquid container. For example, if the liquid container is a swimming pool, the surface of the cover element can be provided to be at least 1 m, preferably at least 1.5 m or at least 2 m below the liquid surface. This can enable use of the swimming pool without coming into contact with the cover element.

[0053] Optionally, the cover element can be connected to the bottom of the liquid container via at least one holding device. Optionally, the holding device can comprise a connecting element and a winding device.

[0054] The holding device can be used to hold the cover element at a specific depth. If necessary, the cover element can be lowered to the desired depth by increasing its average density. The holding device can then be adjusted by adjusting the length of the connecting element, after which the average density of the cover element can be reduced again by pumping in gas. While the cover element is held at the desired depth by the holding device, buoyancy is created that allows the cover element to be loaded with weight. For example, suitable adjustment can enable walking on the cover element below the liquid surface. In this case, the surface of the cover element can also be less than 1 m below the water surface.This can be particularly advantageous if the cover device is used in a swimming pool in which a person is to learn to swim or in cases where standing on a firm surface is desired.

[0055] If necessary, the holding device can be designed as a holding device with a fixed length in order to enable the cover element to be fixed in a specific position.

[0056] If necessary, the shape and size of the cover element can be designed to essentially correspond to the shape and size of the liquid surface in the liquid container. By appropriately adapting the size and shape of the cover element, the most efficient insulation effect is achieved.

[0057] Optionally, it can be provided that in the second position of the covering device a first liquid region and a second liquid region are formed, wherein the covering element forms a separation between the first liquid region and the second liquid region.

[0058] In this case, a circulation pump can be provided which is designed to generate a liquid flow which runs in the opposite direction in the first liquid region and in the second liquid region.

[0059] This makes it particularly easy to create a countercurrent pool. Countercurrent pools of this type allow you to simulate a linear swimming motion within a confined space. The relative movement of the fluid counteracts the user's swimming motion.

[0060] The cover element can be used to demarcate areas with opposing flow directions.

[0061] Optionally, the liquid flow may be provided within a flow channel at least in the second liquid region. To enable more efficient maintenance of a liquid flow, a flow channel may be provided at least partially.

[0062] Optionally, in all embodiments of the cover device, the cover element can comprise a functional element. The functional element can be rotatable relative to the cover element. The functional element can be designed, in particular, as a water attraction, for example, as an underwater treadmill, wave element, and the like. The functional element is advantageously used in combination with a circulation pump designed to generate a liquid flow in the liquid container.

[0063] The functional element may optionally comprise a rotating device configured to change the position of the functional element relative to the cover element. In particular, the rotating device may be configured to change the functional element by approximately 180° relative to the cover element. This allows the functional element to be placed on top of the cover element when in use, while it can be placed on the underside of the cover element when not in use.

[0064] The cover element may comprise a plurality of fluid chambers and / or the fluid chamber may have a plurality of separate sub-chambers.

[0065] If a flat, continuous design of the weight load and / or fluid chamber is not possible, multiple fluid chambers can be provided. In particular, the fluid chambers can be arranged so that the lifting effect coincides with the center of gravity of the weight load.

[0066] When calculating the "average density" within the meaning of the present invention, any additional components that may be present, such as functional elements, must be taken into account.

[0067] If necessary, a measuring device can be provided between the weighting layer and the fluid chamber. This measuring device can be connected to a control unit to control the load-bearing capacity of the fluid chamber by supplying liquid and / or gas. This function is particularly advantageous when lifting weight-loaded components above the fluid level. The measuring device can also be mounted on optionally provided auxiliary lifting structures, such as lifting spindle drives, scissor jacks, or hydraulic cylinders.

[0068] The functional element can be driven by a drive unit that can be arranged in the cover element.

[0069] If a functional element is provided, the area in which the functional element is provided is preferably free of a fluid chamber.

[0070] If necessary, the holding device comprises a scissor jack, a hydraulic ram or a lifting spindle.

[0071] Optionally, the holding device may comprise a plurality of lifting spindles or the like designed to lift the cover element. Optionally, a pressure sensor may be provided on the holding device to measure the load on the holding device.

[0072] The pressure sensor(s) can be connected to a control device designed to control the function of the pumping device. Depending on the measurements of the pressure sensor(s), the amount of fluid or air introduced into the fluid chamber by the pumping device can be determined.

[0073] Further features of the invention emerge from the embodiments, the figures and the patent claims.

[0074] The invention is explained in detail below using three exemplary embodiments. These exemplary embodiments serve merely to illustrate the invention and are not intended to limit the claimed scope of protection in any way.

[0075] They show: Fig. 1 a schematic view of a first embodiment of the present invention in a first position; Fig. 2 a schematic view of the first embodiment of the present invention in a second position; Fig. 3 a schematic view of a second embodiment of the present invention; Fig. 4 a schematic view of a third embodiment of the present invention; Fig. 5a schematic view of a fourth embodiment of the present invention; Fig. 6 a schematic view of a fifth embodiment of the present invention; and Fig. 7 a schematic view of a sixth embodiment of the present invention.

[0076] All of the figures shown show variants of the cover device according to the invention in conjunction with a swimming pool 1 as a liquid container. While the application in conjunction with a swimming pool 1 relates to a preferred embodiment of the invention, the cover device can also be used in conjunction with any other liquid container. For example, the liquid container can also be a storage and / or transport container for liquids. In a preferred case, the liquid is water, but is not limited to this. It is within the skill of a person skilled in the art to adapt the properties of the cover device to the respective application.

[0077] Fig. 1 shows a schematic view of a first embodiment of the present invention in a first position. In the first position, the cover element 2 is arranged at least partially above the liquid surface 14.

[0078] Fig. 2 shows a schematic view of the first embodiment of the present invention in a second position. In the second position, the cover element 2 is arranged completely below the liquid surface 14.

[0079] Since the Fig. 1 and 2 describes the same embodiment, the elements of the two figures are described together below for reasons of clarity. All reference numerals used in the Fig. 1 and 2 used to refer to the same elements.

[0080] In this exemplary embodiment, the cover element 2 is constructed from three layers arranged plane-parallel to one another. The topmost layer in this view forms the weighting layer 7. Directly beneath the weighting layer 7 is the insulation layer 6, beneath which, in turn, the fluid chamber 4 is arranged. The weighting layer 7 and the insulation layer 6 together form the cover layer 3.

[0081] In this embodiment, the swimming pool 1 has a free water surface with a rectangular geometry and a size of approximately 250 cm x 490 cm.

[0082] The cover layer 3 is adapted in size and shape to the open water surface of the swimming pool 1 and is therefore rectangular in this embodiment with a size of 240 cm x 480 cm. If the cover layer 3 is placed centrally on the open water surface, a distance of 5 cm remains from each wall 25 of the swimming pool 1.

[0083] In this exemplary embodiment, the weighting layer 7 is formed from square concrete slabs, each measuring 30 cm x 30 cm. The insulation layer 6 is a full-surface panel of expanded polystyrene measuring 240 cm x 480 cm. The concrete slabs are arranged on the insulation layer 6 such that it is completely covered. In this exemplary embodiment, 8 x 16 concrete slabs are used for this purpose. The concrete slabs are bonded to the insulation layer 6 with a special waterproof adhesive.

[0084] In this exemplary embodiment, the concrete slabs, each approximately 5 cm thick, have a density of approximately 2.6 g / cm 3 . The polystyrene slab of the insulation layer 6, with a thickness of approximately 5 cm, has a density of approximately 0.1 g / cm 3 . Therefore, the covering layer 3 has an average density of approximately 1.35 g / cm 3 . The density and quantity of the adhesive were not taken into account in this calculation, as these are negligible compared to the other components of the covering layer 3. The density of the covering layer 3 is therefore higher than that of water at the temperature of the water in the swimming pool 1 (approximately 25°C, density: approximately 0.997 g / cm 3 ).

[0085] In other embodiments, a reinforcement layer may additionally be provided to mechanically stabilize the cover layer 3. The reinforcement layer may be part of the cover layer 3 and may be made of wood, plastic, or metal, for example.

[0086] A fluid chamber 4 is arranged below the cover layer 3, which in this embodiment is designed as a single fluid chamber 4.

[0087] The fluid chamber 4 is arranged essentially over the entire surface of the cover layer 3. The fluid chamber 4 is made of aluminum sheet with a waterproof coating.

[0088] The fluid chamber 4 has a pressure chamber within it, which has a height of approximately 10 cm across its entire length. Thus, the fluid chamber 4 has an internal volume of approximately 1100 L. The fluid chamber 4 is bonded to the insulation layer 6 of the cover layer 3 via a special waterproof adhesive.

[0089] The fluid chamber 4 is connected via a flexible hose line 8 to a pumping device 5 located outside the swimming pool 1. The pumping device 5 comprises a water pump 10 and an air pump 11, both of which are controlled by a control device 12.

[0090] By means of the pumping device 5, the fluid chamber 4 can be partially or completely filled with water and / or air. Water is drawn directly from the swimming pool 1 via a discharge opening 26, while air is drawn from the ambient air via an intake port 27.

[0091] When the fluid chamber 4 is completely filled with air, the cover element 2 has an average density of approximately 0.7 g / cm 3 . This calculation does not take into account the mass of the aluminum sheet of the fluid chamber 4, which is negligible at a sheet thickness of approximately 1 mm (density of aluminum: approximately 2.7 g / cm 3 ).

[0092] When the fluid chamber 4 is completely filled with air, the average density of the cover element 2 is therefore smaller than that of water, whereby the cover element 2 floats on the liquid surface 14. This corresponds to the first position, which in Fig. 1 is shown.

[0093] If the fluid chamber 4 is completely filled with water, the average density of the cover element 2 is approximately 1.2 g / cm 3 , causing it to sink below the liquid surface 14. This corresponds to the Fig. 2 shown second position.

[0094] In order to withstand filling with water and / or air, reinforcement elements are provided inside the fluid chamber 4, which are not shown in this view.

[0095] In this embodiment, the fluid chamber 4 has a pressure relief valve 9 to prevent overpressure in the fluid chamber 4. Additionally, the pressure relief valve 9 can serve to discharge gas and / or liquid displaced from the fluid chamber 4 by the pump device 5. Several pressure relief valves 9 can be provided, which can optionally be controlled by the control device 12, depending on whether the fluid chamber 4 is filled with gas or liquid.

[0096] In an alternative embodiment (not shown), the pumping device 5 may comprise only an air pump 11. In this case, the air pump 11 may also generate a negative pressure. The liquid required to increase the average density of the cover element can then be sucked in via the pressure relief valve 9.

[0097] In this embodiment, sliding rollers 13 are provided on the edges of the cover element 2 to enable sliding along the walls 25 of the swimming pool 1. Two sets of sliding rollers 13 are provided on each side of the cover element 2. Thus, a total of eight sets of sliding rollers 13 are provided. It is understood that any other number of sliding rollers 13 can also be provided, for example, more sliding rollers 13 if the swimming pool 1 has larger dimensions.

[0098] In this exemplary embodiment, the floor 16 of the swimming pool 1 is connected to the cover element 2 via retaining devices 15. Four retaining devices 15 are provided (only two are visible in the view shown), with each retaining device 15 comprising a winding device 18 and a connecting element 17. The connecting element 17 is designed as a cable in this exemplary embodiment. Alternatively, a chain, a belt, or the like can also be provided as the connecting element 17.

[0099] The holding devices 15 serve to support the lowering of the cover element 2 and to hold the cover element 2 in the second position.

[0100] The holding devices 15 can be used particularly advantageously when the fluid chamber 4 is refilled with gas after the cover element 2 has been lowered into the second position. By reducing the average density of the cover element below the density of water, a buoyancy force is generated, which is counteracted by the holding devices 15. This buoyancy force allows access to the cover layer in the second position. By adjusting the sinking depth of the cover element 2, the apparent water depth can also be changed.

[0101] In the second position, the flexible hose line 8 is in a relaxed state below the cover element 2. If necessary, an elastic hose line 8 can be provided.

[0102] Protruding sealing elements 23 are provided at the edges of the cover element 2, which in this embodiment are made of an elastic plastic material. The sealing elements 23 are designed as sealing lips that completely surround the outer periphery of the cover element 2. At least in the first position, the sealing elements 23 protrude beyond the edge 28 of the swimming pool and thus cover that free water surface of the swimming pool that is not covered by the cover layer 3. When the cover element 2 is lowered, the sealing elements 23 fold upward and are pulled under the liquid surface 14 together with the cover element 2.

[0103] In this embodiment, the control device 12 is coupled to a light barrier 29. If the cover element 2 is to be moved from the first to the second position, water is pumped into the fluid chamber 4 until the light barrier 29 is interrupted. The holding devices 15 are then adjusted by means of the control device 12, and air is pumped into the fluid chamber again. The holding effect of the holding devices 15 holds the cover element 2 in the second position.

[0104] If the cover element 2 is to be moved from the second to the first position, the connecting elements 17 are unrolled by the winding devices 18 and the cover element 2 rises by itself due to the buoyancy.

[0105] In an alternative embodiment (not shown), a depth measuring device can be connected to the control unit 12. The depth measuring device can determine the distance between the liquid surface 14 and the surface of the cover element 2, for example, based on radar or ultrasound. An adjustment device can then be provided, on which the desired sinking depth of the cover element 2 can be set.

[0106] Fig. 3 shows a schematic view of a second embodiment of the present invention. The reference numerals correspond to those elements already explained in detail with reference to the first embodiment. Fig. 3 shows the second embodiment in a second position. In the second position, the cover element 2 is arranged completely below the liquid surface 14.

[0107] In the second position shown, the swimming pool 1 is divided by the cover element 2 into a first liquid region 19 and a second liquid region 20. A circulation pump is provided in the second liquid region 20 and is designed to generate a liquid flow. The liquid flow 22, indicated by arrows, in the first liquid region 19 and the second liquid region 20 runs in opposite directions. The liquid is therefore circulated. This creates a countercurrent in the first liquid region 19, allowing the swimming pool 1 to be used as a countercurrent pool. This enables a user to swim linearly within a limited spatial area. If the flow speed is adapted to the user's swimming speed, the user remains stationary despite their forward movement.

[0108] Fig. 4shows a schematic view of a third embodiment of the present invention. The reference numerals correspond to those elements already explained in detail with reference to the first embodiment.

[0109] Fig. 4 shows the third embodiment in a second position. In the second position, the cover element 2 is arranged completely below the liquid surface 14.

[0110] As in the second embodiment, the third embodiment also provides a first liquid region 19 and a second liquid region 20, in which the liquid can be made to flow in countercurrent. For this purpose, a circulation pump 21 is provided, which, in contrast to the second embodiment, is arranged in a flow channel 24. The flow channel 24 runs in the second liquid region, as well as in the edge regions 30 of the swimming pool 1. The liquid stream 22 exits the flow channel 24 and enters the first liquid region 19, and is then sucked back into the flow channel 24.

[0111] Fig. 5 shows a fourth embodiment of the present invention, which essentially corresponds to the first embodiment. In Fig. 5The cover device is shown in the first position. The difference from the first embodiment is that a flexible return line 30 is arranged on the pressure relief valve 9, which is designed to drain gas and / or liquid from the fluid chamber 4. The return line 30 leads into a compensation chamber 31, in which the filling medium can be stored. Excess gas is discharged via a compensation valve 32.

[0112] The Fig. 5The embodiment shown offers the advantage that the filling medium is conducted in a circuit that is sealed off from the liquid in the swimming pool 1. This prevents the water in the swimming pool 1 from mixing with the filling medium. Any bacterial contamination that may arise in the filling medium cannot enter the water in the swimming pool 1. The filling medium may contain additives that inhibit or prevent the growth of bacteria, algae, and other living organisms.

[0113] Fig. 6 shows a schematic view of a fifth embodiment of the present invention, which essentially corresponds to the first embodiment. Unlike the first embodiment, the sliding rollers 13 are missing. Instead of the sliding rollers 13, a compensation chamber 33 is arranged on the outer edges of the cover element 2, which closes the gap between the cover element 2 and the wall 25 of the swimming pool.

[0114] The compensation chamber 33 is designed in the form of a film tube that surrounds the cover element 2. The compensation chamber 33 is connected to the pump unit 5 via a second hose line 35 and can be filled with gas via the latter to adjust the volume of the compensation chamber 33. A second pressure relief valve 34 is provided for releasing gas.

[0115] In the fifth embodiment, the sealing element 23 is missing, since the sealing of the liquid in the swimming pool 1 against the external atmosphere takes place via the compensation chamber 33, which, when the cover device is used as intended, lies flush against the wall 25 of the swimming pool 1.

[0116] A further difference between the fifth embodiment and the first embodiment is that there is no full-surface fluid chamber 4 arranged on the cover element 2. Instead, the fluid chamber 4 in this embodiment is designed as a film tube that runs in tracks on the liquid-facing side of the cover element 2. The fluid chamber 4 can be filled with gas and / or liquid via the pump device 5. The function is analogous to the previously described embodiments.

[0117] The cover element 2 shown in the fifth embodiment further has opening holes 36 that penetrate the cover layer 3 and the insulation layer 6. This allows fluid to pass through when the cover element 2 is lowered, which facilitates the lowering process.

[0118] Fig. 7shows a schematic view of a sixth embodiment of the present invention, which essentially corresponds to the third embodiment.

[0119] In contrast to the third embodiment, the holding device 15 in this embodiment comprises four lifting spindles 37, which are configured via trolleys 38 to lift the cover element 1.

[0120] In this embodiment, the lifting spindles 37 are driven by a single drive motor, the drive energy of which is transmitted to the spindles 37 via drive shafts (not shown).

[0121] In addition, a functional element 39 is provided in the cover element 2 of the sixth embodiment, which is designed as a shaft element. The functional element 39 can be moved from a first position to a second position via a rotation axis 40. The first position is in Fig. 7The first position is shown in solid lines, while the second position is indicated by dashed lines. Between the two positions, the functional element 39 is rotated by approximately 180°.

[0122] In the first position, the functional element 39 can act as a standing wave when it is subjected to liquid flow 22 and can thus be used, for example, for surfing.

[0123] In the second position, the functional element 39 lies on the underside of the cover element 2 and the cover element 2 has a continuously flat plane on its surface.

[0124] A drive device (not shown) arranged in the cover element 2 is provided to move the functional element 39 between the two positions.

[0125] A pressure sensor 41 is arranged on the trolley 38, which measures the pressure exerted by the cover element 2 on the trolley 38. The pressure sensor 41 is connected to a control device, which controls the pumping device depending on the measured pressure. This allows the pressure exerted on the trolley 38 to be regulated by controlling the buoyancy of the cover device 2. List of reference symbols 1 swimming pool 32 balancing valve 2 Cover element 33 compensation chamber 3 Cover layer 34 second pressure relief valve 4 Fluid chamber 35 second hose line 5 Pumping device 36 opening hole 6 Insulation layer 37 lifting spindle 7 Weighting layer 38 trolley 8 hose line 39 functional element 9 pressure relief valve 40 axis of rotation 10 water pump 41 pressure sensor 11 air pump 12 Control device 13 Sliding rollers 14 liquid surface 15 Holding device 16 Floor 17 connecting element 18 Reeling device 19 first liquid area 20 second liquid area 21 Circulation pump 22 Liquid flow 23 Sealing element 24 flow channel 25 Wall 26 Removal opening 27 Intake manifold 28 edge 29 light barrier 30 Return line 31 compensation chamber

Claims

1. A covering device for liquid containers, in particular for swimming pools (1), comprising a floatable covering element (2), wherein the covering element (2) comprises a continuous covering layer (3) and a fluid chamber (4), connected to the covering layer (3), wherein a pump apparatus (5) is provided, which is configured to convey a liquid, in particular water, and a gas, in particular air, into the fluid chamber (4), wherein the pump apparatus (5) comprises a water pump (10) and an air pump (11), wherein a control apparatus (12) for controlling the pump apparatus (5) is provided, characterised in that a filling medium is provided to fill the fluid chamber (4) with a liquid, the filling medium being circulated in a separate filling medium circuit, such that the filling medium does not come into contact with the liquid in the liquid container.

2. The covering device according to claim 1, characterised in that the covering layer (3) is substantially plane and comprises a substantially plane insulating layer (6) and a weighting layer (7), which is arranged substantially plane-parallel to the insulating layer (6), wherein the covering layer (3) preferably has an average density between 1.1 g / cm3 and 3.0 g / cm3, preferably between 1.2 g / cm3 and 2.0 g / cm3.

3. The covering device according to claim 1 or 2, characterised in that the fluid chamber (4) is designed as a cavity, preferably as a substantially plane cavity with a thickness of preferably 5 cm to 20 cm.

4. The covering device according to one of claims 1 to 3, characterised in that the fluid chamber (4) is made of a flexible material, such as a polyethylene film or the like, or comprises such a material, so that its volume is variable under pressure, and / or in that the fluid chamber (4) is connected to the pump apparatus (5) via a flexible tubing (8).

5. The covering device according to one of claims 1 to 4, characterised in that the fluid chamber (4) has a pressure relief valve (9) to discharge water and / or air.

6. The covering device according to one of claims 1 to 5, characterised in that slide rollers (13) are provided on the outer edges of the covering element (2) to slide the covering element (2) along the inner surface of the liquid container (1), and / or in that cantilevering, preferably resilient, sealing elements (23) are provided on the outer edges of the covering element (2).

7. The covering device according to one of claims 1 to 6, characterised in that a compensation chamber (33), which preferably surrounds the covering element (2), is arranged on the outer edges of the covering element (2) and is designed to at least partially fill a gap between a wall (25) of the liquid container and the covering element (2).

8. The covering device according to one of claims 1 to 7, characterised in that the covering element (2) comprises a rotatable functional element (39), in particular a water attraction.

9. The covering device according to claim 8, characterised in that the functional element (39) comprises a rotating apparatus, which is configured to change the position of the functional element (39) relative to the covering element (2) in particular by about 180°.

10. An arrangement of a covering device according to one of claims 1 to 9 with a liquid-filled liquid container, in particular with a swimming pool (1), characterised - in that the covering element (2) can be or is arranged floating on the liquid surface (14) in a first position, and - in that the covering element (2) can be or is arranged completely below the liquid surface (14) in a second position.

11. The arrangement according to claim 10, characterised in that the covering element (2) is connected to the bottom (16) of the liquid container via at least one holding apparatus (15).

12. The arrangement according to claim 11, characterised in that the holding apparatus (15) comprises a connecting element (17) and a winding apparatus (18).

13. The arrangement according to one of claims 10 to 12, characterised in that, in the second position of the covering device, a first liquid area (19) and a second liquid area (20) are formed, wherein the cover element (2) forms a separation between the first liquid area (19) and the second liquid area (20), and in that a circulating pump (21) is provided, which is adapted to generate a liquid flow (22) which runs in opposite directions in the first liquid area (19) and in the second liquid area (20), the liquid flow (22) preferably running within a flow channel (24) at least in the second liquid area (20).

14. The arrangement according to one of claims 11 to 13, characterised in that the holding apparatus (15) comprises lifting spindles (37), hydraulic rams and / or scissor lifts adapted to lift the covering element (2).

15. The arrangement according to one of claims 11 to 14, characterised in that at least one pressure sensor (41) is provided on the holding apparatus (15) to measure the pressure load of the holding apparatus (15), the pressure sensor optionally being connected to a control apparatus, which is adapted to control the function of the pump apparatus (5).

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